GM 92-93 3.8L VIN L Trouble Code Info

GM

92-93 3.8L VIN L
Flash Code Fault Location Probable Cause
12 Start of diagnosis No engine speed (RPM) signal received
13 Oxygen sensor (O2S)/heated oxygen sensor (HO2S) Wiring open circuit, O2S/HO2S, ECM
14 Coolant temperature sensor signal indicates a temperature of over 275° F for 3 seconds. Wiring short circuit to ground, ECT sensor, ECM
15 Coolant temperature sensor signal indicates a temperature colder than -22° F after the engine has been running for 2 minutes. Wiring open circuit, ECT sensor, ECM
16 Battery voltage – high or low Wiring, alternator, ECM
17 Spark reference circuit Wiring open circuit/short circuit to ground, ICM, ECM
18 Camshaft position (CMP) signal/crankshaft position (CKP) signal error Wiring open circuit/short circuit to ground, CKP sensor, CMP sensor, crankshaft pulley/balancer
19 Crankshaft position (CKP) sensor intermittent 7x signal Wiring, CKP sensor, PROM, ECM
21 TPS voltage was above 2.5 volts for 2 seconds when the MAP sensor signal showed manifold vacuum to be 15 pounds or more under 1800 RPM. Wiring open circuit/short circuit to positive, TP sensor, ECM
22 TPS voltage was under 0.2 volts for 2 seconds when the engine was running. Wiring open circuit/short circuit to ground, TP sensor, ECM
23 Inlet ATS signal showed an air temperature of -22° F after the engine has been running for 1 minute. Wiring open circuit, IAT sensor, ECM
24 Throttle position signal was less than 2% with engine speed between 1400 and 4400 RPM and the MAP signal showed low voltage and high manifold vacuum. Transmission was not in park or neutral. Wiring open circuit/short circuit to ground, PROM, VSS, ECM
25 Inlet ATS signal showed an air temperature over 275° F for more than 2 seconds after the engine has been running for 5 minutes and vehicle speed was greater than 44 MPH. Wiring short circuit to ground, IAT sensor, ECM
26 Engine control module quad driver/output driver Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM (*see below for additional information)
27 Engine control module quad driver/output driver Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM (*see below for additional information)
28 Engine control module quad driver/output driver Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM (*see below for additional information)
29 Transmission gear switch signal circuit 4th gear Wiring open circuit/short circuit to ground, 4th gear switch, ECM
31 Park/neutral position (PNP) switch Wiring open circuit/short circuit to ground, incorrectly adjusted, PNP switch, ECM
32 EGR open command did not change the fuel mixture when the command was given during off idle operation. EGR opening should cause the mixture to be slightly richer because of the low oxygen content of exhaust gas. Wiring open circuit/short circuit to ground, EGR valve, ECM
33 MAP sensor signal voltage was too high (low vacuum) for at least 5 seconds when throttle opening was under 2%. Wiring open circuit/short circuit to positive, hose blocked/leaking, MAP sensor, ECM
34 Mass air flow (MAF) snesor – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, MAF sensor, ECM
35 Idle speed was over 150 RPM outside the desired engine speed commanded by the ECM. Wiring open circuit/short circuit to ground/short circuit to positive, IAC valve, ECM
36 Shift solenoids (SS) Wiring open circuit/short circuit to ground, SS
37 Brake pedal position (BPP) switch for torque converter clutch (TCC) Wiring open circuit/short circuit to ground, incorrectly adjusted BPP switch, BPP switch, ECM
38 Brake pedal position (BPP) switch/ torque converter clutch (TCC) Wiring open circuit/short circuit to ground, supply wire, BPP switch, TCC switch, ECM
39 Torque converter clutch (TCC) Wiring open circuit/short circuit to ground, TCC solenoid, BPP switch, cooling fan fuse, transmission mechanical fault, ECM
41 Camshaft position (CMP) sensor Wiring open circuit/short circuit to ground, CMP sensor, ICM, ECM
42 The EST signal did not change when the ECM applied bypass voltage to the ignition module. Wiring open circuit/short circuit to ground, ICM, ECM
43 Knock sensor (KS) Wiring open circuit/short circuit to ground/short to positive, KS, PROM, ECM
44 Oxygen sensor voltage was under 0.2 volts for 60 seconds of closed loop operation. Wiring short circuit to ground, fuel pressure low, MAP sensor, misfire, fuel contamination, exhaust system leaking, O2S/HO2S, ECM
45 Oxygen sensor voltage was above specification. Century and Cutlass Ciera was over 0.75 volts for 50 seconds in a closed loop. Lumina was over 0.7 volts for 30 seconds and throttle angle was between 3% and 45%. Fuel pressure high, injector(s) leaking, O2S contamination, EVAP canister purge valve, TP sensor, MAP sensor, EGR system, O2S/H2OS, ECM
46 Immobilizer control module – fuel enable signal Incorrect ignition key, wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module, ECM
51 PROM error. Insecure PROM, incorrect PROM, ECM
53 (Only Year 1993) Exhaust gas recirculation (EGR) valve solenoid 1 Wiring open circuit/short circuit to ground,exhaust system blocked, EGR valve, ECM
54 Exhaust gas recirculation (EGR) valve solenoid 2 Wiring open circuit/short circuit to ground, exhaust system blocked, EGR valve, ECM
55 (Only Year 1993) Exhaust gas recirculation (EGR) valve solenoid 3 Wiring open circuit/short circuit to ground, exhaust system blocked, EGR valve, ECM
56 Engine control module quad driver/output driver Wiring, ECM controlled components, ECM
57 Boost control problem Wiring short circuit to ground, hoses blocked/leaking, boost bypass actuator, boost control solenoid, ECM
58 Immobilizer control module – fuel enable signal Incorrect ignition key, wiring open circuit/short circuit to ground/short circuit to positive, immobilizer control module, ECM
59 Transmission fluid temperature (TFT) sensor -voltage high Wiring open circuit, TFT sensor, ECM
61 Cruise control vent solenoid Wiring open circuit/short circuit to ground/short to positive, cruise control servo, ECM
62 Cruise control vacuum solenoid Wiring open circuit/short circuit to ground/short to positive, cruise control servo, ECM
63 Cruise control servo position sensor – circuit malfunction Wiring open circuit/short circuit to ground/short to positive, hoses leaking, cruise control servo, ECM
65 Cruise control servo position sensor – circuit malfunction Wiring open circuit/short circuit to ground/short to positive, cruise control servo, ECM
66 Low A/C refrigerant charge Wiring open circuit/short circuit to ground, low A/C refrigerant charge, blocked A/C orifice tube, A/C refrigerant low pressure switch, A/C refrigerant high pressure switch, A/C amplifier, ECM
67 Cruise control switch – circuit malfunction Wiring open circuit/short circuit to positive, cruise control switch, brake pedal vacuum valve, ECM
68 Cruise control servo – servo position sensor high Hoses blocked, brake pedal vacuum valve, cruise control servo, cruise control cable binding
69 A/C refrigerant pressure switch – engine coolant blower motors Wiring short circuit to ground, A/C refrigerant pressure switch, ECM
70 A/C refrigerant pressure sensor – voltage high Wiring open circuit/short circuit to positive, A/C refrigerant pressure sensor, ECM
72 Vehicle Speed Sensor (VSS) Wiring open circuit/short circuit to ground, VSS, ECM
75 Exhaust gas recirculation (EGR) valve solenoid 1 Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
76 Exhaust gas recirculation (EGR) valve solenoid 2 Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
77 Exhaust gas recirculation (EGR) valve solenoid 3 Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
79 Transmission fluid temperature (TFT) – high Transmission mechanical fault, towing
80 Torque converter clutch (TCC) – slipping Wiring open circuit/short circuit to ground, supply wire, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
82 Ignition control module (ICM) – 3X reference circuit malfunction Wiring open circuit/short circuit to ground, supply wire, CKP signal sensor, ICM, ECM
85 Engine control module (ECM) – PROM Insecure PROM, incorrectly coded
86 Engine control module (ECM) – analogue/digital converter A/C refrigerant pressure sensro/KS/ECT sensor/fuel pump monitor circuit short circuit to battery voltage
87 Engine control module (ECM) – PROM error Insecure PROM, incorrectly coded
90 Torque converter clutch (TCC) – stuck ON Wiring open circuit/short circuit to ground, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
96 Engine control module (ECM) – ignition supply voltage low Wiring open circuit, alternator, ECM
98 Engine control module (ECM) – incorrectly coded ECM incorrectly coded, ECM
99 Cruise control – power management mode Hoses blocked, brake pedal vacuum valve, cruise control servo, cruise control cable binding
* Depending on model, year and equipment level, the following components may be connected to this circuit. Use of the vehicle wiring diagram is recommended to confirm which components are fitted.
A/C compressor clutch relay Exhaust gas recirculation (EGR) solenoid
A/C condenser blower motor relay Malfunction indicator lamp (MIL)
Engine coolant blower motor relay Transmission shift warning light (MT)
Engine coolant ‘hot’ warning lamp Torque converter clutch (TCC) solenoid
Evaporative emission (EVAP) canister purge Transmission shift solenoids (SS)